<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css" media="screen">
        #box{
            width: 200px;
            height: 200px;
            background-color: red;
            border:1px solid black;
        }
    </style>
</head>
<body>
    <div id="box"></div>
</body>
</html>